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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2397] Query to return every Nth value from the collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-2397</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Various relational databases have all implemented their own methods to return every nth value from the database. It doesn&apos;t seem like MongoDB has the capability at all. &lt;/p&gt;

&lt;p&gt;My use case it storing a year&apos;s worth of data with second granularity. I want to graph an overview of the year and allow a drill down to smaller time granulations. Thus my year query would request every 10000th value (for example) while an hours worth would return every value. Both of these queries would return roughly the same amount of data so be worked with in the application.&lt;/p&gt;

&lt;p&gt;I realize you&apos;d incur a lot of file seek times if you had to grab data spanning multiple files but I still need the capability.&lt;/p&gt;</description>
                <environment></environment>
        <key id="14279">SERVER-2397</key>
            <summary>Query to return every Nth value from the collection</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="jmthomas">Jason Thomas</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Jan 2011 23:07:04 +0000</created>
                <updated>Tue, 6 Dec 2022 05:45:56 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>4</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="58869" author="redbeard0531" created="Thu, 6 Oct 2011 19:15:03 +0000"  >&lt;p&gt;Some discussion of workarounds at &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/3d730dd50bffea1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/3d730dd50bffea1c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="22624" author="jmthomas" created="Mon, 24 Jan 2011 19:11:14 +0000"  >&lt;p&gt;It varies by DB  because SQL doesn&apos;t define a good way to do this.&lt;/p&gt;

&lt;p&gt;In Oracle:&lt;br/&gt;
     select &amp;lt;item&amp;gt; from &amp;lt;table&amp;gt; group by &amp;lt;item&amp;gt;, rownum having mod(rownum, 100)=0&lt;/p&gt;

&lt;p&gt;In MySQL:&lt;br/&gt;
      SET @row=0;select &amp;lt;item&amp;gt;,@row:=@row+1 as num FROM &amp;lt;table&amp;gt; HAVING (num+1)%100=0&lt;/p&gt;

&lt;p&gt;In Sqlite:&lt;br/&gt;
     select &amp;lt;item&amp;gt; from &amp;lt;table&amp;gt; group by &amp;lt;item&amp;gt; having rowid % 100=0&lt;/p&gt;
</comment>
                            <comment id="22608" author="eliot" created="Sun, 23 Jan 2011 08:15:42 +0000"  >&lt;p&gt;How would you do this in sql?&lt;/p&gt;</comment>
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